g1601_1700.s1641_count_sorted_vowel_strings

Class Solution

java.lang.Object

g1601_1700.s1641_count_sorted_vowel_strings.Solution

public class Solution
extends Object

1641 - Count Sorted Vowel Strings.

Medium

Given an integer n, return the number of strings of length n that consist only of vowels (a_,_ e_,_ i_,_ o_,_ u_) and are lexicographically sorted._

A string s is lexicographically sorted if for all valid i, s[i] is the same as or comes before s[i+1] in the alphabet.

Example 1:

Input: n = 1

Output: 5

Explanation: The 5 sorted strings that consist of vowels only are ["a","e","i","o","u"].

Example 2:

Input: n = 2

Output: 15

Explanation: The 15 sorted strings that consist of vowels only are

[“aa”,“ae”,“ai”,“ao”,“au”,“ee”,“ei”,“eo”,“eu”,“ii”,“io”,“iu”,“oo”,“ou”,“uu”].

Note that “ea” is not a valid string since ‘e’ comes after ‘a’ in the alphabet.

Example 3:

Input: n = 33

Output: 66045

Constraints:

• 1 <= n <= 50

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

Modifier and Type	Method and Description
int	countVowelStrings(int n)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Solution

public Solution()

Method Detail

countVowelStrings

public int countVowelStrings(int n)